Facilitated diffusion is the passive transport of solute diffusion conducted by transport proteins present in the plasma membrane.
This mode of transport is used by molecules that cannot freely cross the phospholipid bilayer and are mediated by channel proteins and carrier proteins.
This diffusion process does not require energy molecules such as ATP.
In this mode of transport, the molecules move from a region of higher concentration to a region of lower concentration.
Factors such as temperature, the concentration of molecules, molecule size, and diffusion distance influence the diffusion process.